Help wanted: How to attach file with unicode name

[RangerMak]

I'm trying to attach file using writer.addFileAttachment().
Name of file contains cyrillic symbols which not shown in resulted PDF.

How to attach file with unicode name?

[RangerMak]

Solved:

PdfFileSpecification fs = PdfFileSpecification.fileEmbedded(writer, null, fileName, binary, PdfStream.BEST_COMPRESSION);
fs.setUnicodeFileName(fileName, true);
writer.addFileAttachment(null, fs);

It will be better to add unicode checking to public static PdfFileSpecification fileEmbedded(PdfWriter writer, String filePath, String fileDisplay, byte[] fileStore, String mimeType, PdfDictionary fileParameter, int compressionLevel)?
For example like this:

fs.setUnicodeFileName(fileDisplay, !PdfEncodings.isPdfDocEncoding(fileDisplay));

[asturio]

You mean if the file name contains non-ASCII character (or at least non-Latin symbols) the file name won't be shown?

Pull request welcome.